package com.hmall.trade.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmall.api.client.CartClient;
import com.hmall.api.dto.OrderDetailDTO;
import com.hmall.common.constants.MqConstants;
import com.hmall.common.domain.MultiDelayMessage;
import com.hmall.common.exception.BadRequestException;
import com.hmall.common.utils.BeanUtils;
import com.hmall.common.utils.UserContext;
import com.hmall.api.dto.ItemDTO;
import com.hmall.trade.constants.TradeMqConstants;
import com.hmall.trade.domain.dto.OrderFormDTO;
import com.hmall.trade.domain.po.Order;
import com.hmall.trade.domain.po.OrderDetail;
import com.hmall.trade.mapper.OrderMapper;
import com.hmall.api.client.ItemClient;
import com.hmall.trade.service.IOrderDetailService;
import com.hmall.trade.service.IOrderService;
import com.rabbitmq.client.AMQP;
import io.seata.spring.annotation.GlobalTransactional;
import lombok.RequiredArgsConstructor;
import org.springframework.amqp.AmqpException;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessagePostProcessor;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author itheima
 * @since 2023-05-05
 */
@Service
@RequiredArgsConstructor
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Order> implements IOrderService {

    private final ItemClient itemClient;
    private final IOrderDetailService detailService;
    private final CartClient cartClient;
    private final RabbitTemplate rabbitTemplate;

    @Override
    //@Transactional
    @GlobalTransactional //使用分布式事务控制
    public Long createOrder(OrderFormDTO orderFormDTO) {
        // 1.订单数据
        Order order = new Order();
        // 1.1.查询商品
        List<OrderDetailDTO> detailDTOS = orderFormDTO.getDetails();
        // 1.2.获取商品id和数量的Map
        Map<Long, Integer> itemNumMap = detailDTOS.stream()
                .collect(Collectors.toMap(OrderDetailDTO::getItemId, OrderDetailDTO::getNum));
        Set<Long> itemIds = itemNumMap.keySet();
        // 1.3.查询商品
        List<ItemDTO> items = itemClient.queryItemByIds(itemIds);
        if (items == null || items.size() < itemIds.size()) {
            throw new BadRequestException("商品不存在");
        }
        // 1.4.基于商品价格、购买数量计算商品总价：totalFee
        int total = 0;
        for (ItemDTO item : items) {
            total += item.getPrice() * itemNumMap.get(item.getId());
        }
        order.setTotalFee(total);
        // 1.5.其它属性
        order.setPaymentType(orderFormDTO.getPaymentType());
        order.setUserId(UserContext.getUser());
        order.setStatus(1);
        // 1.6.将Order写入数据库order表中
        save(order);

        // 2.保存订单详情
        List<OrderDetail> details = buildDetails(order.getId(), items, itemNumMap);
        detailService.saveBatch(details);

        // 3.清理购物车商品
        //cartClient.deleteCartItemByIds(itemIds);
        rabbitTemplate.convertAndSend(MqConstants.TRADE_EXCHANGE_NAME, MqConstants.ROUTING_KEY_ORDER_CREATE, itemIds, new MessagePostProcessor() {
            //在消息发送之前，最后对消息进行处理
            @Override
            public Message postProcessMessage(Message message) throws AmqpException {
                //将当前登录用户的id设置到消息头部中
                message.getMessageProperties().setHeader("user-info", UserContext.getUser());

                return message;
            }
        });

        //int i = 1/0;
        // 4.扣减库存
        try {
            itemClient.deductStock(detailDTOS);
        } catch (Exception e) {
            throw new RuntimeException("库存不足！");
        }

        //发送延迟消息
        //创建要发送的消息对象
        MultiDelayMessage<Long> delayMessage = MultiDelayMessage.of(order.getId(), 3000, 5000, 7000, 5000);
        rabbitTemplate.convertAndSend(TradeMqConstants.DELAY_EXCHANGE, TradeMqConstants.DELAY_ORDER_ROUTING_KEY,
                delayMessage, new MessagePostProcessor() {
                    @Override
                    public Message postProcessMessage(Message message) throws AmqpException {
                        //设置延迟时间
                        message.getMessageProperties().setDelay(3000);
                        return message;
                    }
                });

        return order.getId();
    }

    @Override
    @GlobalTransactional
    public void cancleOrder(Long orderId) {
        //- 将查询该订单对于的商品列表
        List<OrderDetail> orderDetailList = detailService.lambdaQuery().eq(OrderDetail::getOrderId, orderId).list();
        List<OrderDetailDTO> orderDetailDTOList = BeanUtils.copyList(orderDetailList, OrderDetailDTO.class);
        //- 将上述商品对于的购买数量返还到 商品微服务item-service  ---》优化：利用已有的一些接口实现 返还库存
        //将购买的商品数量变为负值
        for (OrderDetailDTO orderDetailDTO : orderDetailDTOList) {
            orderDetailDTO.setNum(-orderDetailDTO.getNum());
        }
        itemClient.deductStock(orderDetailDTOList);

        //- 更新交易订单的状态为取消（状态为5）
        lambdaUpdate().set(Order::getStatus, 5)
                .set(Order::getCloseTime, LocalDateTime.now())
                .eq(Order::getId, orderId)
                .eq(Order::getStatus, 1)
                .update();
    }

    @Override
    public void markOrderPaySuccess(Long orderId) {
        /*//查询订单
        Order oldOrder = getById(orderId);

        //如果订单非未支付的话则不更新
        if (oldOrder == null || oldOrder.getStatus() > 1) {
            return;
        }

        Order order = new Order();
        order.setId(orderId);
        order.setStatus(2);
        order.setPayTime(LocalDateTime.now());
        updateById(order);*/

        //update order set status = 2, pay_time = now() where id = orderId and status = 1
        lambdaUpdate().set(Order::getStatus, 2)
                .set(Order::getPayTime, LocalDateTime.now())
                .eq(Order::getStatus, 1)
                .eq(Order::getId, orderId)
                .update();
    }

    private List<OrderDetail> buildDetails(Long orderId, List<ItemDTO> items, Map<Long, Integer> numMap) {
        List<OrderDetail> details = new ArrayList<>(items.size());
        for (ItemDTO item : items) {
            OrderDetail detail = new OrderDetail();
            detail.setName(item.getName());
            detail.setSpec(item.getSpec());
            detail.setPrice(item.getPrice());
            detail.setNum(numMap.get(item.getId()));
            detail.setItemId(item.getId());
            detail.setImage(item.getImage());
            detail.setOrderId(orderId);
            details.add(detail);
        }
        return details;
    }
}
